Mold for making metal castings



June 5, 1923.

J. E. GOENS MOLD FOR MAKING METAL CASTINGS Filed Feb. 14, 1922 2 SheetsSheet 1 QIQIIzeaE 6 06928" INVENTOR WITNESSES ATTORNEY June 5, 1923. 1,457,362

J. E. GOENS MOLD FOR MAKING METAL CASTINGS Filed Feb. 14, 1922 2 Sheets-Sheet 2 u afizes i Goens NVENTOR ATTQ R N EY Patented June 5, 1921i.

JAMES EDWARD GOENS, OF ROANOKE, VIRGINIA.

MOLD FOR MAKING METAL CASTINGS.

Application filed February 14, 1922. Serial No. 586,588.

To all whom it may concern:

Be it known that 1, JAMES E. Gonna, a citizen of the United States, residin at Roanoke, in the county of Roanoke an State of Virgina, have invented new and useful Improvements in Molds for Making Metal Castings, of which the following is a specification.

This invention relates to improvements in molds for making metal castings, particularly annular castings such as freight car wheels, although it is applicable to the manufacture of cast metal articles of other description. I

One of the objects of the invention is to provide an improved form of center core made hollow so that the metal is allowed to shrink freely and may be easil removed from the casting after the casting is removed from the mold. The ordinary solid center core is diflicult to remove from the hub of a car wheel casting, and considerable time and labor is usually expended in knocking and digging it out of the casting. The improved core is referably formed so that it is held immovably in the mold while the metal is being poured and provides an annular gate for the metal which extends around the top of the core.

Another object is to provide a novel form of ate closin means.

he invention has other objects which will be understood from the present specification when read in connection with the 85 drawings, wherein a preferred form of the invention is shown by way of illustration.

In the drawings:

Figure 1 is a central vertical sectional view of a mold for car wheels showing the parts assembled, the mold 'cavity having been formed;

i are 2 is a similar view showing the after pouring;

igure 3 is a vertical section of the dra 46 and the casting and core, the cope an gate having been removed and.

Figure 4 is a perspective view of the hollow center core.

F met F Referring more specifically to the drawings, there is shown a mold for car wheels includlng a drag 1, a cope 2 and a chill 3, all of which are of well known construction and need not be further described. Moldin sand 4 is shown packed into the drag an cope, and by the impression of the pattern in the sand, a casting space or chamber 5' (Fig. 1) is made for the reception of the molten metal poured through the gate 6.

A hub block 7 is shown in Figure 1 which consists preferabl of a wooden block provided with a ban 1e and an aluminum gate closing element or bottom 8 adapted to fit upon the top of the center core 9. This center core, which is made from moldin is supported upon the sand of the re 1. The aluminum gate closing element or ottom, which may be made of any other material than aluminum, has a central circular projection 10, which is received within a. complementary shallow depression 11 (Fig.

'4) in the top of the core 9. This depression is made at the time of making the core. The upper end of the core which has its exterior wall tapering, pro'ects into the gate 6 and the space between t e upper tapered end of the core and the inner wall of the gate 6 is closed by the annular tapering flange 12 of the gate element 8. When the hub block is removed, an annular space or gate opening is provided completely around the top of the hollow core which opening gommunicates with the mold cavity or chamer 5. I

In order to impart a yielding quality to the core and to make its removal from the casting an easy operation, it is made hollow or cup-shaped by the provision of a central cavity 13. The open core end which rests upon the sand of the drag, has an annular shoulder 14 and a tapering extremity 15 so that a double seat is rovided, whereby the core is held firmly and is not likely to wobble-or shift its position when the metal is cast. It will be noted that the center core projectsboth above and below the mold chamber or cavity 5. The top of the core is domesand,-

shaped, which imparts strength thereto to resist the strain of pouring the molten metal thereon.

In order to cast a car wheel with the apparatus shown in Fig. 1' it is only necessary to remove the hub block 7 and pour the metal into the mold through the gate 6, whereupon the mold cavity or chamber will be filled and the surplus metal will rise in the passageway of the gate 6, as shown in Fig. 2. During the pouring, the meta-lfirst strikes the depression 11 in the top of the center core, and then spreads out in all directions and passes down through the annular space or gateway left between the upper end of the core and the inner wall of gate 6. This gateway is so designed that the slag does not pass down into the casting space but remains above the core 9. Due to'the ta ered upper end of the core 9 and the tapere flange 12 of the gate element, the annular space provided as a gateway for the passage of the metal decreases in width as shown in Figures 1 and 2, so that at the bottom of the gate 6, the

annular space through which the molten metal runs is relatively narrow. At the same time, the space, being annular, is sufiicient to pass a large quantity of metal during a short time interval. As Figure 2 shows, the greater portion of the pouring head is filled with molten metal. This is necessary to give the proper pressure on the mold and to fill up the mold cavity and make it solid.

After the car wheel or other object has been cast, the cope and the chill are removed, leaving the cooling car wheel on the drag, as Fig. 3 illustrates. The metal in the pouring head shown in Figure 2 is connected by a very thin annular neck to the car wheel castin and is, therefore, broken off easily and c eanly from the wheel at the time of removing the cope (see Fig. 3). In doing this the top or ring of the core is broken by the same operation, leaving an opening for the grabs to be thrust through the hollow core, in removing the cast wheel from the mold.

The hollow center core is so shaped that it has sufficient strength at the top to withstand the weight oi the metal during pouring, and yet is thin walled and allows the metal to shrink; and this shrinkage loosens the core and makes its removal easy without resortin to special implements for the purpose. hen drying it is stood on the upper end. It will require less ramming of the head as the head block is not removed until after the mold has been finished.

At the time the hub is bored for the axle, the inconspicuous ring of surplus metal left when the pipe is broken ofi, shown in Fig. 3, is easil cut ofi.

While have shown and described a preferred embodiment of the invention and a preferred use to which it may be put, it will be understood that many changes from the above description may be made without departing from the spirit and scope of my invention, which is best defined in the following claims.

What is claimed is:

1. In a mold for casting annular objects, a hollow center core made of molding sand and shaped somewhat like a cup, said core having an annular shoulder and a tapering extremity on its lower and open end beyond the shoulder which open end is supported and closed by the sand in the drag, the tapering extremity entering therein, and havin a dome-shaped closed upper end upon whic the molten metal may be poured.

2. In a mold for casting annular objects, a hollow center core made of molding sand shaped similarly to a cup in one piece and supported by the sand in the drag and extendin through the casting space into the gate 0 the mold, said core having a tape!- in and closed upper end, said upper end being spaced from the wall of the gate of the mold so as to provide a narrow annular gateway for the molten metal.

3. In a mold for casting annular objects a hollow center core made of molding sand in one piece, said core extending through the casting space into the gate of the mold, the upper and closed end of the core being spaced from the wall of the gate of the mold so as to provide a narrow annular gateway for the molten metal, surrounding the top of the core.

4. In a.mold for casting annular objects, a hollow center core made of molding sand in one piece supported upon the sand in the drag and extending u through the mold cavity into the gate of t e mold, the upper end of the core being closed and having a shallow external depression, and said upper end being spaced from the wall of the mold gate, whereby a narrow annular gateway for the molten metal is provided extending around the upper end of the core and communicating with the mold cavity.

5. In a mold for casting annular objects, a center core supported within the mold and projecting into the gate of the mold, the upper end of the core bein tapered and spaced slightly from the wal of the gate, whereby a narrow annular channel is provided for the passage of the molten metal into the casting space, and a depression formed in the top of the core.

6. Means for closing the gates of car wheel molds, includin ,a block adapted to fit within the gate of t e mold, and a. metallic gate closing element having a depending annular flange attached to the underside of the block, said annular flan being tapered and adapted to fit around t e upper end of the center core of the mold to close a passage provided between the center core and the wall of the gate.

7 In a mold, the combination with a center core supported within the mold and projecting into the gate, of a block adapted to fit within the gate of the mold, and a metallic gate closing element having an annular flange and attached to the under side of the block, said annular flange being ada ted to close the passage provided between t e center core of the mold and the wall of the ate, the upper end of the core having a sha ow depression so that when the metal is poured into the gate it will strike this depression before descending into the said passage, and the gate closing element also having a projection on its under side fitting said depression. V

In testimon that I claim the foregoing as my own, have hereto aflixed my signature.

JAMES EDWARD GOENS. 

